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    <meta charset="UTF-8" />
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    <title>Document</title>
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    <button>点我跳转到b页面 同时携带num参数</button>
    <script>
      //我是a页面
      var num = 9999999; //数据
      var btn = document.querySelector("button");
      btn.onclick = function () {
        window.location.href = "./b.html?num=" + num;
      };
    </script>
  </body>
</html>
